* {
  padding: 0;
  margin: 0;
  list-style: none;
  box-sizing: border-box;
}
a{
  text-decoration: none;
}
#root {
  width: 100vw;
  height: 100vh;
  display: flex;
  flex-direction: column;
}
header {
  width: 100%;
  height: 50px;
}
main {
  flex: 1;
  background-color: #f5f5f5;
  overflow-y: scroll;
}
footer{
  width: 100%;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-around;
}

.active {
  color: red;
}